4CP | Four Color Process

Art by Neal Adams.

Art by Fletcher Hanks, "Jungle Comics" #10, 1940.

Additional posts from the same story:

http://4cp.posthaven.com/fantomah

http://4cp.posthaven.com/fletcher-hanks-1940

Art by Floyd Gottfredson and Al Taliaferro. Scanned from a 1941 comic reprinting a late 1930s newspaper strip.